In the following figure, if the coordinates of P are (a, b, c), then the coordinates of A, B and C are respectively

(a, 0, 0), (b, 0, 0), (c, 0, 0) (a, 0, 0), (0, b, 0), (0, 0, c) (0, 0, a), (0, b, 0), (c, 0, 0) (a, b, c), (b, c, a), (c, a, b)

(a, 0, 0), (b, 0, 0), (c, 0, 0)

Clearly, Oa = a, OB = b and OC = c As A, B and C lie on X-axis, Y-axis and Z-axis respectively. So, the coordinates of A, B and C are (a, 0, 0), (0, b, 0) and (0, 0, c) respectively.